Heavy Water 

D2O, 2 Deuterium, and 1 Oxygen atom. Deuterium is an isotope of hydrogen; it has one extra neutron in the nucleus. Neutrons are what add weight to an atom; this substance is called "Heavy Water" as compared to normal "Light Water." Heavy water exists is most all water, but only in very small amounts (1 in 20 million).

Heavy water is essential to nuclear power using non-enriched uranium. Without it, all uranium must be enriched before use. In WW-II, Hitler attacked Norway for it’s supply of heavy water.

"Heavy water aids in cooling nuclear reactors.

Heavy Water by Contraceptive SpongeBob April 17, 2006

heavy meat 

1. A giant or enormous penis.
2. Literally wrecking pussy with a protracted pounding of thundercock. 'Cock and Awe' fucking.

"I can tell you why Sabrina still has that silly look on her face, Dude. I spent like six hours last night pouring the heavy meat to her."

heavy meat by Mo Dixley June 13, 2008

Heavy Fucking Metal 

It is what it is; Heavy Fucking Metal. Heavy Metal that is fucking heavy. Heavy Metal that's so fucking heavy it's not just Heavy Metal any more; it's Heavy FUCKING Metal.

Heavy Fucking Metal is...
Heavy.

Fucking.

Metal.

Heavy Fucking Metal by Metalheadzzyzx May 18, 2010

heavy wrist action 

The act of cutting cocaine, thus the 'heavy wrist' action.

heavy wrist action, flush it with the water, then you buy a charger

heavy wrist action by the shit, bitch November 15, 2009

heavy heavy low low 

Heavy Heavy Low Low is a five piece band from San Jose, California. Forming in early 2004, the band started as more of a screamo unit before adopting their current style. Their music incorporates several elements from grindcore, such as blast beats, chaotic song structures, and shorter than average song lengths (a typical live set of about 10-12 songs lasts about 20 minutes). Heavy Heavy Low Low gained notoriety largely through word of mouth, internet hype and extensive touring. Their debut release "Everything's Watched, Everyone's Watching", an eleven song session of metal/thrash/hardcore/grindcore recordings, was released on New Weathermen records, an imprint of Ferret, in September of 2006.

Heavy Heavy Low Low gained underground fame with their first album Courtside Seats To The Greatest Fuck Of All Time, which features their first single "Inhalent Abuse Is Illegal And Can Be Fatal." They expanded their fame with the release of their "Fuck It" EP, which features their most well known song "Tell Shannon Her Crafts Are Ready." With the release of their third installment "Everything's Watched, Everyone's Watching" they have toned down their distinctly grindcore/expreimental roots. The screams and growls are still there but are supplemented by the singer almost talking. They are currently signed with Ferret Records.

so basically kids, they're the best fucking san jose based band ever!

you:what do you wanna listen to?
me:heavy heavy low low dumbass, what do you think?
you:why? they're all grindcore and shit.
me:fuck you, i'm leaving!

heavy heavy low low by FightTheBattleWinTheWar April 28, 2007

Heavy Bertation 

A general state of confusion, usually at an awards show or other celebrity event.

Everything started out fine but once the drinks were served the night quickly devolved into very heavy bertation.

Heavy Bertation by Bryan Ganman March 5, 2011

Heavy Cumer 

Male of the species that when completing sex, cums in such a large volume that there is a measurable weight shift among the two parties (or one party and a sock)

Terri: Was the first time sex with your new boyfriend amazing?
Anne: It was great, but he is such a "Heavy Cumer" that I put on almost two pounds and barely made it to the bathroom!

Heavy Cumer by Urban humor May 25, 2016